dxflib parses DXF files and hands you the data as well as providing some convenience functions to write DXF files. Note that for writing, you still need a good understanding of the DXF format to write the sections in the correct order, etc. dxflib does not require any non-standard third party libraries or frameworks. dxflib does not interpret the data in a DXF file in any way nor does it know (or care) how to visualize entities. dxflib is solely about reading and writing data from and to the DXF format.

The QCAD C++ libraries are a completely different matter. They contain an entire CAD engine, graphics views, etc. So this is very likely overkill for you. The QCAD C++ libraries also depend on Qt.

Where can I see the current progress of the dxflib? Do you provide
some public repository where I can see changes, contributors etc?